Heater



FIG. 1 is top perspective of a heater;

FIG. 2 is a front view of the heater shown in FIG. 1;

FIG. 3 is a right side view of the heater shown in FIG. 1;

FIG. 4 is a rear view of the heater shown in FIG. 1;

FIG. 5 is a left side view of the heater shown in FIG. 1;

FIG. 6 is a top view of the heater shown in FIG. 1; and,

FIG. 7 is a bottom view of the heater shown in FIG. 1.

The broken lines shown in the drawings are included for the purpose of illustrating portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for heater, as shown and described. 